fuel sender

[bob guttenberg]

I have tried searching multiple sites for information on a replacement fuel guage sender for my 1984 sea ray with 125 gal gasoline fuel tank. The last one a marine repair place installed only reads half full with full tank.

 

[Lazy Daze]

Maybe they installed it wrong where the float hits a side wall and doesn't go all the way up. Pull it out and check it. Otherwise, just measure the tank depth and order the sender accordingly... based on the style you want.

 

[boatman37]

I just replaced mine and it was a 'one size fits all' sort of thing where you had to trim the rod to the correct length based on the chart they supplied. I bought the same unit as was already on there and it was accurate so I just removed the old rod and float and used it on the new one but yeah what Lazy Daze says is true. Mine can be rotated 360* to best fit my tank so if it is in at the wrong angle it could be hitting the side of the tank and not able to float all the way up

 

[Bt Doctur]

get a Moeller unit

 

[Ike]

There are a variety of sending units. The classic float on an arm is the most commonly used. It works by moving a contact on a variable resister which varies the current (very low current) going to the gauge. Then there is a float on a rod or tube. These work by magnetic induction and are more accurate than the float on an arm. The most recent and probably the most accurate is the (no moving parts) capacitance sender. Of course it is also the most expensive. The number one maker of tank senders is WEMA (now known as KUS) http://wemausa.com/ Just about everybody who sells tank senders has them made by WEMA. You can buy them from almost any marine retailer even West Marine, or on-line marine parts suppliers.

Anyway, if the sender in your tank is the old float on an arm style, and is not installed correctly, as has been pointed out, you just need to rotate it. But if you do that make sure the gasket is good. If it is fairly new, maybe no problem. But after loosening it to check the sender, and reinstalling it, have you service people pressure test it to make sure it is sealing. You only need to pressure test the tank. Do not use more than 3 psi.